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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 44/67] fscache: disable cookie when doing an invalidation for DIO write From: David Howells To: linux-cachefs@redhat.com Cc: Jeff Layton , dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , Matthew Wilcox , Alexander Viro , Omar Sandoval , Linus Torvalds , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 18 Oct 2021 16:01:24 +0100 Message-ID: <163456928482.2614702.6139737560803005640.stgit@warthog.procyon.org.uk> In-Reply-To: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> References: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org From: Jeff Layton O_DIRECT I/O is probably a good indicator that we don't need to be caching this file at the moment. Disable the cookie by treating it as we would a NULL cookie after the invalidation completes. Reenable when the last unuse is done. Signed-off-by: Jeff Layton Signed-off-by: David Howells --- fs/afs/file.c | 2 +- fs/fscache/cookie.c | 5 +++++ include/linux/fscache.h | 15 ++++++++++----- 3 files changed, 16 insertions(+), 6 deletions(-) diff --git a/fs/afs/file.c b/fs/afs/file.c index 5e29d433960d..5e674a503c1b 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -357,7 +357,7 @@ static bool afs_is_cache_enabled(struct inode *inode) { struct fscache_cookie *cookie = afs_vnode_cache(AFS_FS_I(inode)); - return fscache_cookie_valid(cookie) && cookie->cache_priv; + return fscache_cookie_enabled(cookie) && cookie->cache_priv; } static int afs_begin_cache_operation(struct netfs_read_request *rreq) diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c index 8731188a5ac7..70bfbd269652 100644 --- a/fs/fscache/cookie.c +++ b/fs/fscache/cookie.c @@ -522,6 +522,7 @@ void __fscache_unuse_cookie(struct fscache_cookie *cookie, __fscache_update_cookie(cookie, aux_data, object_size); cookie->unused_at = jiffies; if (atomic_dec_return(&cookie->n_active) == 0) { + clear_bit(FSCACHE_COOKIE_DISABLED, &cookie->flags); if (test_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags)) { spin_lock(&fscache_cookie_lru_lock); if (list_empty(&cookie->commit_link)) { @@ -715,6 +716,10 @@ void __fscache_invalidate(struct fscache_cookie *cookie, "Trying to invalidate relinquished cookie\n")) return; + if ((flags & FSCACHE_INVAL_DIO_WRITE) && + test_and_set_bit(FSCACHE_COOKIE_DISABLED, &cookie->flags)) + return; + spin_lock(&cookie->lock); set_bit(FSCACHE_COOKIE_NO_DATA_TO_READ, &cookie->flags); fscache_update_aux(cookie, aux_data, &new_size); diff --git a/include/linux/fscache.h b/include/linux/fscache.h index a29bd81996ea..08663ad7feed 100644 --- a/include/linux/fscache.h +++ b/include/linux/fscache.h @@ -28,12 +28,14 @@ #define fscache_volume_valid(volume) (volume) #define fscache_cookie_valid(cookie) (cookie) #define fscache_resources_valid(cres) ((cres)->cache_priv) +#define fscache_cookie_enabled(cookie) (cookie && !test_bit(FSCACHE_COOKIE_DISABLED, &cookie->flags)) #else #define __fscache_available (0) #define fscache_available() (0) #define fscache_volume_valid(volume) (0) #define fscache_cookie_valid(cookie) (0) #define fscache_resources_valid(cres) (false) +#define fscache_cookie_enabled(cookie) (0) #endif struct fscache_cookie; @@ -43,6 +45,8 @@ struct fscache_cookie; #define FSCACHE_ADV_WRITE_NOCACHE 0x02 /* Don't cache if written to locally */ #define FSCACHE_ADV_FALLBACK_IO 0x04 /* Going to use the fallback I/O API (dangerous) */ +#define FSCACHE_INVAL_DIO_WRITE 0x01 /* Invalidate due to DIO write */ + enum fscache_want_stage { FSCACHE_WANT_PARAMS, FSCACHE_WANT_WRITE, @@ -120,6 +124,7 @@ struct fscache_cookie { #define FSCACHE_COOKIE_NO_DATA_TO_READ 3 /* T if this cookie has nothing to read */ #define FSCACHE_COOKIE_NEEDS_UPDATE 4 /* T if attrs have been updated */ #define FSCACHE_COOKIE_HAS_BEEN_CACHED 5 /* T if cookie needs withdraw-on-relinq */ +#define FSCACHE_COOKIE_DISABLED 6 /* T if cookie has been disabled */ #define FSCACHE_COOKIE_NACC_ELEVATED 8 /* T if n_accesses is incremented */ #define FSCACHE_COOKIE_DO_RELINQUISH 9 /* T if this cookie needs relinquishment */ #define FSCACHE_COOKIE_DO_WITHDRAW 10 /* T if this cookie needs withdrawing */ @@ -352,7 +357,7 @@ static inline void fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data, const loff_t *object_size) { - if (fscache_cookie_valid(cookie)) + if (fscache_cookie_enabled(cookie)) __fscache_update_cookie(cookie, aux_data, object_size); } @@ -410,7 +415,7 @@ static inline void fscache_invalidate(struct fscache_cookie *cookie, const void *aux_data, loff_t size, unsigned int flags) { - if (fscache_cookie_valid(cookie)) + if (fscache_cookie_enabled(cookie)) __fscache_invalidate(cookie, aux_data, size, flags); } @@ -449,7 +454,7 @@ static inline int fscache_begin_read_operation(struct netfs_cache_resources *cres, struct fscache_cookie *cookie) { - if (fscache_cookie_valid(cookie)) + if (fscache_cookie_enabled(cookie)) return __fscache_begin_read_operation(cres, cookie); return -ENOBUFS; } @@ -578,7 +583,7 @@ static inline void fscache_clear_inode_writeback(struct fscache_cookie *cookie, static inline int fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page) { - if (fscache_cookie_valid(cookie)) + if (fscache_cookie_enabled(cookie)) return __fscache_fallback_read_page(cookie, page); return -ENOBUFS; } @@ -598,7 +603,7 @@ int fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page) static inline int fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page) { - if (fscache_cookie_valid(cookie)) + if (fscache_cookie_enabled(cookie)) return __fscache_fallback_write_page(cookie, page); return -ENOBUFS; }